public class PositionNewEditOverrideExtension{
    // This simple extension is to demonstrate overriding the save function, and how to determine if the record
    //   should be updated or inserted during the save operation.  This extension could be used on both
    //   an Edit override and a New override simultaneously.
    
    // TODO: Declare a variable to hold the position.
    private Position__c pos;
    
    // TODO: Declare a Boolean variable to track if this is an insert or an update.
    private Boolean bUpdate;

    // Declare standardController controller
    private ApexPages.StandardController controller;

    // Declare a string property to hold a message value
    public String myMessage { get; set; }

    
    // TODO: Write the extension constructor and initialize the member position variable by using a method on the standard controller.
   	// TODO: Then update the Boolean to store if this is a create or update
    public PositionNewEditOverrideExtension(ApexPages.StandardController stdController) {

    	controller = stdController;
    	this.pos= (Position__c)stdController.getRecord();

    	bUpdate = pos.id == null ? false : true;
    }

    
    // This function is called from a commandButton on the page
    public PageReference SayHelloWorld(){
        // call this custom function from your visualforce page
        myMessage = 'Hello World!';

        // We're not redirecting the user to a different page so we just say return null
        return null;
    }
    
    public PageReference mysave(){
		//TODO: Override the save function.  Check to see if this is an insert or update and use the right DML command
        //TODO: Then navigate using the standard controller.
        if (bUpdate){
        	// We could add custom behavior here
            update pos;
        } else {
        	// We could add custom behavior here
        	insert pos;
			controller = new ApexPages.StandardController(pos);  // re-instantiate the controller based on the new record
        }
        
        // Use the standardController to navigate : avoid string-based PageReference redirects if possible
        return controller.view();

    }
   
}